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Cryptocurrency Ethereum Mastering Development

In Python, how do I use subscriptions, or otherwise perform asynchronous operations?

I have the following code that polls for transactions every second. I want to make it more responsive, and not use polling, but instead something quicker. tx_all_pending = w3.eth.filter(‘pending’) while True: pending_txs = tx_all_pending.get_new_entries() … time.sleep(1) In javascript, this is done using web3.eth.subscribe with a callback function. Is there something similar in Python? I realize […]

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Linux Mastering Development

Blinking cursor after checking /dev/sda2 on boot in Ubuntu

A few weeks ago, I installed Ubuntu 20.04 on my Acer C720 (Intel Celeron 2955U, 2GB LPDDR3 RAM). (I used MrChromebox UEFI firmware). No problems, works OK, a bit slow, and some internal GTK errors that might be from the ram (a few years ago, I installed Ubuntu 16.04 on an HP DC7900 which also […]

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Mastering Development

Is there a way to get the starts and ends of numbers between a split from an array?

Sorry, I don’t even know what title to give this problem. I have an array of numbers I call pages. They are pages I need to print out physically from say a browser. pagesToPrint = [2,3,4,5,7,8,9,12,14,15,16,17,18,19,20] Now, what is the problem with just printing 2,3,4,5,7…20? When a page or pages are sent to the printer […]

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Mastering Development

Storing the value of a method that has returned a value in a class

I am to summarise just using Caesar cipher on my python program to encrypt and decrypt. However, I seem to be completely lost because I want to return self.cipher which is the encrypted message. I want to be able to store this value and use it to decrypt it in my other method decryptCipher. I […]

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Mastering Development

Error when trying to run OpenALPR in python

I installed OpenALPR itself fine and I was able to run it in terminal to get this result: C:\Users\zebsu>"C:\\OpenALPR\\Agent\\bin\\alpr.exe" "C:\\plate.jpg" plate0: 3 results State ID: us-oh (97% confidence) – PZ65BYV confidence: 94.5181 pattern_match: 0 – P265BYV confidence: 81.1941 pattern_match: 0 – P65BYV confidence: 81.1336 pattern_match: 0 However, I then followed the instructions found on PyPI […]

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Mastering Development

How do you pause between text in this code?

I’m trying to put a pause between "Long ago," and what comes after that but I’m having trouble trying to do it. How could I make it work? I’ve attempted to use a timer but I’m not very good at doing that which made it hard to implement it. Here is my code: var snd: […]

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Mastering Development

Spring Boot Refuses to Start, problem with AbstractRepositoryConfigurationSourceSupport

I created a project using the Spring Starter, but it won’t run. It gives me an error message that looks like this: Description: An attempt was made to call a method that does not exist. The attempt was made from the following location: org.springframework.boot.autoconfigure.data.AbstractRepositoryConfigurationSourceSupport$AutoConfiguredAnnotationRepositoryConfigurationSource.<init>(AbstractRepositoryConfigurationSourceSupport.java:133) The following method did not exist: org.springframework.data.repository.config.AnnotationRepositoryConfigurationSource.<init>(Lorg/springframework/core/type/AnnotationMetadata;Ljava/lang/Class;Lorg/springframework/core/io/ResourceLoader;Lorg/springframework/core/env/Environment;Lorg/springframework/beans/factory/support/BeanDefinitionRegistry;Lorg/springframework/beans/factory/support/BeanNameGenerator;)V The method’s class, org.springframework.data.repository.config.AnnotationRepositoryConfigurationSource, […]

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Mastering Development

How can I create an object in TypeScript with a constrained generic value type?

I know that key/value objects in TypeScript are typed like this: const animals: { [key: string]: string } = { a1: "cat", a2: "dog" }; The above object only allows values of type string. Now, let’s say I have this abstract class abstract class Animal { abstract makeSound(): void; move(): void { console.log("roaming the earth…"); […]

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Mastering Development

Ansible: print only user defined variables

How can I print variables declared only at group_vars, host_vars without ansible facts? such code is good: – name: "Ansible | List all known variables and facts" debug: var: hostvars[inventory_hostname] But I don’t need host IPs,disks, etc. I mean to check all my variables one more time before continue to execute Play.

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Mastering Development

How to change size of pagination icons in angular-slickgrid

i have to reduce size of pagination icons and fonts in order to fit into a slickgrid attached screenshot for ref- enter image description here